LED's do flash once but no colour change, although the pattern does obviously change. As it's a GPS/laser system I don't have Genghis's problem with radar alerts in town, and it has a 'mute' button with which I can cancel an individual alert, rather than having to turn down the volume for all subsequent alerts.
What I have been doing though is trying to build it into my 'scan' (sorry to bring in more aviation stuff but couldn't think of a better word), in the same way that Genghis has his mounted somewhere in his normal scan. As I've chosen to have it display my GPS speed this is actually quite handy as it's nearer my field of view than normal speedo, although the offset to the left is a slight problem.
Nice idea about the speaker, but not sure if that's within my technical capabilities, or indeed where I'd put such a speaker. What would be good though, would be a system connected to the stereo to give alerts through that, and turn the volume of the music down as necessary (my speakers are more powerful and can cut through the wind noise, it's quite scary realising how loud it's been playing as I slow down!). Maybe some form of bluetooth connectivity in the future? Any electronics firms reading this make the royalties cheques payable to Fordhom Enterprises Ltd!
My only real issue with mounting it in front of me is purely aesthetic I'm afraid - I think it looks 'cooler' to one side, being the hip young funkster that I am........